Noise barrier

Abstract

A noise barrier system having support members and noise absorbing panels is disclosed. The noise absorbing panels include a front corrugated perforated sheet and a rear corrugated solid sheet which define a chamber. A central sinusoidally corrugated perforated sheet is provided within the chamber. A first blanket of low frequency noise absorbing material is disposed adjacent the front face of the central member and is configured so that a resonance zone is provided between the first blanket and the rear surface of the front sheet. A second blanket of higher frequency sound absorbing material is provided between the rear surface of the central member and the front surface of the rear sheet.

What is claimed is: 
     
       1. A noise barrier panel for the abatement of noise from a noise source, comprising: a. a perforated front sheet forming the front outer wall of the panel, said front sheet having a front surface in facing relation to said noise source and a rear surface;   b. a nonperforated rear sheet forming the rear outer wall of the panel and held in spaced, noncontacting relationship to the front sheet so as to define a chamber therebetween, said rear sheet having a front side in facing relation to said noise source and a rear side;   c. a central, perforated corrugated sheet element disposed in said chamber, said central element having a front face in facing relation to said noise source and a rear face;   d. a first noise absorbing blanket of material disposed between the rear surface of said front sheet and the front face of said central sheet; and   e. a second noise absorbing material disposed between the rear face of said central sheet and the front side of said rear sheet.   
     
     
       2. The noise absorbing panel of claim 1 further comprising a resonance zone space between said rear surface of said front sheet and the front face of said first blanket of material. 
     
     
       3. The noise barrier of claim 1 in which said front and rear sheets are corrugated. 
     
     
       4. The noise barrier panel of claim 3 in which the corrugations of said front and said rear sheets run in a direction parallel to the corrugations of said central element. 
     
     
       5. The noise barrier panel of claim 4 in which the corrugations of said central sheet extend vertically. 
     
     
       6. The noise barrier panel of claim 4 in which the corrugations in said central sheet extend horizontally. 
     
     
       7. The noise barrier panel of claim 1 in which said central element is corrugated so as to reflect sound energy impinging said front face into said first blanket and to reflect sound energy impinging said rear face into said second blanket. 
     
     
       8. The noise barrier panel of claim 1 in which the perforations in said front sheet comprise between 23 and 33 percent of the surface area of said front sheet. 
     
     
       9. The noise barrier panel of claim 1 in which the perforations in said central element comprise between 23 and 33 percent of the surface area of said central element. 
     
     
       10. The noise barrier panel of claim 1 in which said first noise absorbing material comprises a blanket of material which is adapted to absorb low frequency sound energy. 
     
     
       11. The noise barrier of claim 10 in which said second noise absorbing material comprises a blanket of material which is adapted to absorb high frequency sound energy. 
     
     
       12. A noise barrier assembly for the abatement of noise from a noise source, comprising: a. a plurality of vertical posts adapted to be mounted in spaced parallel relationship, the posts each having vertical grooves facing an adjacent post;   b. a plurality of noise barrier panels disposed between the grooves in adjacent posts, each noise barrier panel comprising: (1) a perforated front sheet forming the front outer wall of the panel, said front sheet having a front surface in facing relation to said noise source and a rear surface;   (2) a nonperforated rear sheet forming the rear outer wall of the panel and held in spaced, noncontacting relationship to the front sheet so as to define a chamber therebetween, said rear sheet having a front side in facing relation to said noise source and a rear side;   (3) a central, perforated corrugated sheet element disposed in said chamber, said central element having a front face in facing relation to said noise source and a rear face;   (4) a first noise absorbing blanket of material disposed between the rear surface of said front sheet and the front face of said central sheet; and   (5) a second noise absorbing blanket of material disposed between the rear face of said central sheet and the front side of said rear sheet.     
     
     
       13. The noise barrier assembly of claim 12 in which said noise barrier panel further comprises a resonance zone space between said rear surface of said front sheet and front front face of said first blanket of material. 
     
     
       14. The noise barrier assembly of claim 12 in which said front and rear sheets are corrugated. 
     
     
       15. The noise barrier assembly of claim 14 in which the corrugations of said front and said rear sheets run in a direction parallel to the corrugations of said central element. 
     
     
       16. The noise barrier assembly of claim 15 in which the corrugations of said central sheet extend vertically. 
     
     
       17. The noise barrier assembly of claim 15 in which the corrugations in said central sheet extend horizontally. 
     
     
       18. The noise barrier assembly of claim 12 in which said central element is corrugated so as to reflect sound energy impinging said front face into said first blanket and to reflect sound energy impinging said rear face into said second blanket. 
     
     
       19. The noise barrier assembly of claim 12 in which the perforations in said front sheet comprise between 23 and 33 percent of the surface area of said front sheet. 
     
     
       20. The noise barrier assembly of claim 12 in which the perforations in said central element comprise between 23 and 33 percent of the surface area of said central element. 
     
     
       21. The noise barrier assembly of claim 12 in which said first noise absorbing material comprises a blanket of material which is adapted to absorb low frequency sound energy. 
     
     
       22. The noise barrier assembly of claim 12 in which said second noise absorbing material comprises a blanket of material which is adapted to absorb high frequency sound energy.